I guess the internal arts and Baji would be good since they like to get close, and BJJ tends to be more internal or soft as well. Tim Cartmel is a well-known example of this at shenwu.com.

i wish that people would stop using tim cartmel as an example of how the so-called internal arts are a great compliment to BJJ. IMHO the more valuable lesson to be learned would be how *rare* it is to find someone with both good, fight-oriented CMA training and a mind open enough to embrace BJJ as a way to compliment their training.

the OP would be wise to realize that the chances of finding a good CMA sifu are very small, and that his goal should be to find the best striking coach they can find, regardless of style.

"Face punches are an essential character building part of a martial art. You don't truly love your children unless you allow them to get punched in the face." - chi-conspiricy
"When I was a little boy, I had a sailor suit, but it didn't mean I was in the Navy." - Mtripp on the subject of a 5 year old karate black belt
"Without actual qualifications to be a Zen teacher, your instructor is just another roundeye raping Asian culture for a buck." - Errant108
"Seriously, who gives a **** what you or Errant think? You're Asian males, everyone just ignores you, unless you're in a krotty movie." - new2bjj

It is both traditional and Modern. It's a traditional CMA ruleset that was updated, no killing, for modern times.

Interesting. What are you calling traditional Sanshou, the way military trains it? That's not much older is it? Is it that the art of Sanshou was updated with new rules, or that a new sport was created which happens to have the same name as something else?

i wish that people would stop using tim cartmel as an example of how the so-called internal arts are a great compliment to BJJ. IMHO the more valuable lesson to be learned would be how *rare* it is to find someone with both good, fight-oriented CMA training and a mind open enough to embrace BJJ as a way to compliment their training.

Unfortunately it is all too rare. And like you said not just for internal CMA but for all of CMA. I think that says more about the traditions and mindset of the practitioners than how well the styles actually complement each other. Of course quality instruction trumps style any day.

new sport was created which happens to have the same name as something else?

This. San da/san shou was the original sparring component of CMA schools. It was de-emphasized throughout the 20th century as empty handed fighting became less common/necessary for the average Chinese, and taolu became emphasized, leading to the many shitty CMA schools we see today.

Where empty handed fighting never lost its emphasis or importance was in the Chinese military, so it was there that san shou was able to live on...and continue evolving into the military training/sport you're referring to. But in a traditional school pre-20th century, san shou would have been a seamless part of the training.

Back then if your kung fu was weak from a lack of training san shou, you'd probably end up dead. People today are free to do taolu all day long and never have to worry it won't help them in a confrontation.

"Around 1900 there were the rebels that practiced martial arts who opposed the Manchu’sduring the Qing Dynasty and would also use their skills against foreign powers. The failure of the rebellion lead ten years later to the fall of the Qing Dynasty and the creation of the Chinese Republic."

...Hung ga was one of those arts, by the way, and the rebellious spirit is alive and well!...

"During this Republic period between 1912 to 1949 Chinese martial arts became more accessible to the general public as many practitioners of martial arts were encouraged to openly teach to the public. At that time, some considered martial arts as a means to promote national pride and build a strong nation. As a result, many Schools and academies were created and training manuels were published.

If the question is which one would make your BJJ game better, the answer is more BJJ. If the question is which style will help you get to the ground to use your BJJ, probably sanshou because that kung fu will actually teach you to dump people on the ground, and it will also teach you to use boxing covers, which is useful for getting close enough for the takedown. Your style field says boxing though, so you might already know that stuff, and it may also make you feel silly holding a wing chun guard or other CMA stance for fighting (a lot of CMA guys just use a modified boxing stance though).

Cung Le's book on San Shou has a great discussion of the two primary stances used in the "sport", but plenty of san shou fighters probably practice some traditional stancework (as in strength training stancework) as well.